Why was Rin such a bitch to Sakura throughout Heaven's Feel?

>>159327102
I think you mix stuff up; rin was the girl killed by kakashi; sakura had no sister.

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>>159327102
Because all the F/SN girls are combinations of two Tsukihime girls. Rin in HF inherited the witch-hunting sycophant bitch part from Ciel.

>>159327102
Her idea about it was just to immediately go to "Welp, the ends justify the means" and just kill Sakura. If Sakura was going on a huge murderous rampage, it didn't matter what she wanted. Sakura had to be killed.
Helping Shirou by keeping her alive was like keeping a huge bomb just ticking instead of deactivating it for Rin.
Whether it was her sister or not, Rin wanted to put her own emotions aside and kill Sakura before she was able to kill dozens of people.
But Heaven's Feel is all about why this mentality is wrong